/**
 * #      331
 * 名称   验证二叉树的前序序列化
 * 链接   https://leetcode-cn.com/problems/verify-preorder-serialization-of-a-binary-tree
 * 题解   [461](https://leetcode-cn.com/problems/verify-preorder-serialization-of-a-binary-tree/solution)
 * 通过率 47.8%
 * 难道   中等
 */

